18918234 has 48 divisors (see below), whose sum is σ = 42254784. Its totient is φ = 6115200.

The previous prime is 18918233. The next prime is 18918253. The reversal of 18918234 is 43281981.

It is not an unprimeable number, because it can be changed into a prime (18918233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144349 + ... + 144479.

It is an arithmetic number, because the mean of its divisors is an integer number (880308).

Almost surely, 2^18918234 is an apocalyptic number.

18918234 is an abundant number, since it is smaller than the sum of its proper divisors (23336550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18918234 is a wasteful number, since it uses less digits than its factorization.

18918234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 320 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18918234 is about 4349.5096275327. The cubic root of 18918234 is about 266.4568345855.

The spelling of 18918234 in words is "eighteen million, nine hundred eighteen thousand, two hundred thirty-four".